I have a 120hp OMC out drive with electric shift and am swapping the shift control with the outdrive to another boat. My question is where do I hook it up to the ignition? I know the controller is good I tested it threw the wiring harness with a hot wire and test light. So I?m guessing to the accessory? There is just two wires a purple one that controls the forward and reverse and the white one is for the neutral.